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ZX-AEF70CCDE62025年10月美国A卷(数易) · 第 20 题
2025年10月美国A卷(数易) · 原库模块 1 · Q20 原库参考解析
For a study, a research team measured the heights of 380 king penguins from the Kerguelen Islands and 190 king penguins from the Falkland Islands. The research team determined that the mean height of the 380 king penguins from the Kerguelen Islands was 87 centimeters and the mean height of the 190 king penguins from the Falkland Islands was 93 centimeters. What was the mean height, in centimeters, of all 570 king penguins the research team measured for this study?
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